I recently acquired a launch that was “no longer working” for free, and after doing some research and reading this awesome resource, i think the only problem with it is the small magnet (that i found stuck to the screw drive) came dislodged. I have verified that it will complete the initial startup and homing if i hold the magnet on the inside of the device when i turn it on. so now that i know what’s wrong i cant figure out how to get at where it needs to be reglued. I have it mostly tore down but cant see how to get at the sliding ring to re attach the magnet.
On the front of the sliding part there should be a small recess at the bottom.
(just barely an outline of the magnet, not big enough to actually put it inside)
So the magnet sits “behind” the control-panel that’s on the front of the device.
Hard to see/notice from the outside, but once you know where it is, it should be easy to reattach the magnet with some strong glue.
Maybe this user that had the same issue took some pictures or can provide further help: